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ATSDR Releases Final Report on GenOn Energy, Inc./Mirant Potomac River Generating Station Site

A final version of a report on air quality near the GenOn Energy, Inc. site, formerly known as Mirant Potomac River Generating Station includes new data from after the station’s 2009 stack merge, but does not change ATSDR’s conclusions or recommendations.

In its report, ATSDR addressed public comments. The agency also applauded local efforts to pursue reductions in air contamination.

The original report looked at data from 2007 and 2008; a new appendix examined data from 2009 and 2010. Information from after the stack merge showed lower sulfur dioxide measurements at the remaining three monitoring stations.

However, this information may not be representative of an overall lowering of sulfur dioxide levels; as the station’s output was lower during the time period of the later assessment, and the pre-and post-stack merge operating data were not taken during the same seasonal periods.

ATSDR’s conclusions are:

Breathing air contaminated with sulfur dioxide near the site was not expected to harm the health of the general population.

Sulfur dioxide levels could have been infrequently high enough to temporarily harm some sensitive groups, such as people with asthma.

Levels of fine particulate matter (PM2.5) were elevated similar to levels throughout northern Virginia; PM2.5 is a regional concern and not specific to the area, but people in the Alexandria area could experience harmful health effects.

Arsenic and chromium were found at levels that could cause slight health risks. Levels observed were consistent with those routinely observed in suburban and urban locations nationwide.

Since 2004, the Virginia Department of Environmental Quality (VDEQ), the City of Alexandria, and the Environmental Protection Agency (EPA) have been working to reduce emissions at the plant, due to estimates that showed levels of sulfur dioxide and particulate matter might be elevated.

ATSDR recommends that the VDEQ continue its efforts to reduce sulfur dioxide emissions at the plant.

VDEQ and the City of Alexandria should also continue efforts to reduce fine particulate matter emissions in the city and in the state of Virginia. Reducing fine particulate matter should also reduce exposure to arsenic and chromium.